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NVD / CVE Program· CNA redhat

CVE-2026-16526: Pcp: pcp: privilege escalation to root via linux_sockets pmda vulnerability

Noroxi assessment

Priority: Monitor (action score 35/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.57% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: pcp (AlmaLinux:10) 7.0.3-5.el10_2; pcp-conf (AlmaLinux:10) 7.0.3-5.el10_2; pcp-devel (AlmaLinux:10) 7.0.3-5.el10_2.

Low priority for now. Upgrade to pcp (AlmaLinux:10) 7.0.3-5.el10_2; pcp-conf (AlmaLinux:10) 7.0.3-5.el10_2; pcp-devel (AlmaLinux:10) 7.0.3-5.el10_2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A flaw in the PCP linux_sockets module exposes an unsecured internal connection. An attacker with initial code execution can exploit this to escalate privileges and execute arbitrary commands as root.

HighCVSS 8.8 · v3.1—No exploit Fix available
Published
Jul 30, 2026
Updated
Nov 4, 2026
EPSS
0.5% · 47th percentile

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
8.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-16526

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 10

    • 0:7.0.3-5.el10_2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support

    • 0:6.3.7-1.el10_0.1 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 8

    • 0:5.3.7-22.el8_10.5 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

    • 0:5.2.5-8.el8_4.1 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

    • 0:5.2.5-8.el8_4.1 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

    • 0:5.3.5-10.el8_6.1 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

    • 0:5.3.5-10.el8_6.1 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service

    • 0:5.3.7-19.el8_8.1 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

    • 0:5.3.7-19.el8_8.1 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 9

    • 0:6.3.7-8.el9_8.4 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10pcpbefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-confbefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-develbefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-docbefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-export-pcp2elasticsearchbefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-export-pcp2graphitebefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-export-pcp2influxdbbefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-export-pcp2jsonbefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-export-pcp2openmetricsbefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-export-pcp2opentelemetrybefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-export-pcp2sparkbefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-export-pcp2xmlbefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-export-pcp2zabbixbefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-export-zabbix-agentbefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-geolocatebefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-guibefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-import-benchmarksbefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-import-collectl2pcpbefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-import-ganglia2pcpbefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-import-iostat2pcpbefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-import-mrtg2pcpbefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-import-pmseriesbefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-import-sar2pcpbefore 7.0.3-5.el10_27.0.3-5.el10_2
AlmaLinux:10pcp-libsbefore 7.0.3-5.el10_27.0.3-5.el10_2

+96

Same product

red hat: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-10230Samba: command injection in wins server hook script
    52Plan
  • CVE-2026-4631Cockpit: cockpit: unauthenticated remote code execution due to ssh command-line argument injection
    44Plan
  • CVE-2026-76578Ipa: freeipa: freeipa: unauthenticated ldap client can obtain administrator credentials via the self-managed-token aci
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-18220Jul 29, 2026 · Binutils: binutils: out-of-bounds write in bfd dlx elf backend relocation processing
    31Monitor
  • ← EarlierCVE-2026-16524Jul 30, 2026 · Pcp: pcp linux_sockets pmda: arbitrary command execution via command injection
    31Monitor
  • Later →CVE-2026-16527Jul 30, 2026 · Pcp: pcp pmproxy: unauthenticated access to /store endpoint allows bypassing pmcd access rules
    29Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:pcp-conf5.3.7-22.el8_10.5 · AlmaLinux:8Package registry (OSV)
almalinux:pcp-devel5.3.7-22.el8_10.5 · AlmaLinux:8Package registry (OSV)
almalinux:pcp-doc5.3.7-22.el8_10.5 · AlmaLinux:8Package registry (OSV)
almalinux:pcp-export-pcp2elasticsearch5.3.7-22.el8_10.5 · AlmaLinux:8Package registry (OSV)
almalinux:pcp-export-pcp2graphite5.3.7-22.el8_10.5 · AlmaLinux:8Package registry (OSV)
almalinux:pcp-export-pcp2influxdb5.3.7-22.el8_10.5 · AlmaLinux:8Package registry (OSV)
almalinux:pcp-export-pcp2json5.3.7-22.el8_10.5 · AlmaLinux:8Package registry (OSV)
almalinux:pcp-export-pcp2spark5.3.7-22.el8_10.5 · AlmaLinux:8Package registry (OSV)
almalinux:pcp-export-pcp2xml5.3.7-22.el8_10.5 · AlmaLinux:8Package registry (OSV)
almalinux:pcp-export-pcp2zabbix5.3.7-22.el8_10.5 · AlmaLinux:8Package registry (OSV)
almalinux:pcp-export-zabbix-agent5.3.7-22.el8_10.5 · AlmaLinux:8Package registry (OSV)
almalinux:pcp-gui5.3.7-22.el8_10.5 · AlmaLinux:8Package registry (OSV)
debian:pcp7.2.0-1 · Debian:14Package registry (OSV)
opensuse:pcp6.3.8-3.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:pcp0:5.3.7-22.el8_10.5 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:pcp-conf0:5.3.7-22.el8_10.5 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:pcp-debuginfo0:5.3.7-22.el8_10.5 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:pcp-debugsource0:5.3.7-22.el8_10.5 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:pcp-devel0:5.3.7-22.el8_10.5 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:pcp-devel-debuginfo0:5.3.7-22.el8_10.5 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:pcp-doc0:5.3.7-22.el8_10.5 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:pcp-export-pcp2elasticsearch0:5.3.7-22.el8_10.5 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:pcp-export-pcp2graphite0:5.3.7-22.el8_10.5 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:pcp-export-pcp2influxdb0:5.3.7-22.el8_10.5 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:pcp-export-pcp2json0:5.3.7-22.el8_10.5 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:pcp-export-pcp2spark0:5.3.7-22.el8_10.5 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
rocky linux:pcp0:5.3.7-22.el8_10.5 · Rocky Linux:8Package registry (OSV)
suse:pcp6.2.0-2.1 · SUSE:Linux Micro 6.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

—

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

  • CVE-2026-165270 days apartPcp: pcp pmproxy: unauthenticated access to /store endpoint allows bypassing pmcd access rules
    29Monitor
  • CVE-2026-158129 days apartKronosnet: kronosnet: access control list bypass via link id spoofing on unencrypted dynamic links
    19Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-403 · Exposure of File Descriptor to Unintended Control Sphere ('File Descriptor Leak')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓
  2. SSVC exploitation— → none

For records you follow, these changes also arrive as notifications. →

References

Show all references (11 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records